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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5e06bfdb3aecacbbff5281e8d0326caa0a5015a53ff365a0de08afea02238e' 
  AND token = 'akS/QHgUFSswu9VMv/JPB6LdjJnelSR/1nbBGy9/I3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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