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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a8694d4d6352a2d5e762d9a0ddd07df60af00e98b40884670e596eb346ea72' 
  AND token = 'IhEyhIQSHkMzfXE5cir9fENZLZVt9jnP+84iIOFljxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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