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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd762a7364be20cd083d474ca37204522610444329e35ad603f55618ee9a153b0' 
  AND token = 'TOtW3uEQ0l7tNKWCr+Oi/G3ICAy39hpIlOCqDIsCDA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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