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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986f9e4e6622ea642e77acb3ddd44da0dd344bb3189ccdeac728e842e22dfcf8' 
  AND token = '/ybw6BCBuI/sl9LmcBeqaVjcpA1VxpEpSC0OaNpvV/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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