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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f43766aa7bf5bc19a73a892e47a518c64e266de612dfc046da472749dd6160' 
  AND token = 'Gee7q1uMK1e6HVsRZd0hiEtuv2rdU2TjTBSUnlCENNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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