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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b7ba7ff343855f0c74666a0e33e081a7cdb56f37100fddb6c33ab6ba19f5d8' 
  AND token = 'G1Q7/pxatm5tL7ZBn0MInufFRwiu78NjvHZ8f7kBaS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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