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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc42c84a5102d57adbf1514ecb00dea302e9d978d7d613d78cf3f771566c3c8' 
  AND token = 'fmFcUwl8591Fh8aK74vdtLfOFRV3SiNK+r3JiDIjiG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}