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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550037851c0beba59400e7028ad623a7a2713920b3e0f39e103b6ce0670f347e' 
  AND token = 'ujQ7fA5UCMAVGDZzVF4PKx325qfiMX2OBCTtdguDbyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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