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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ecee9493c639296f13ac0afb97348ffa155032682419adc3ccbfb293ca4a43' 
  AND token = '/GXD622k5WZfZngCG2y6Eh8eIvg1JnKVwrKUAQ6pXcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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