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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77c0c5ee114c8a7b8141f2a9eeb29587b8551341438fada712ff7d5b932c092' 
  AND token = 'nPVB4wg3fPEbsDK3rSY1Lr/soXm1ZOHmEjf17v94shk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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