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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '966e1f9432d4a202ed33549a71f45854d37314aa739d3c663baa83e0d29cd8ce' 
  AND token = '9uCrVpzEy/nCcRAj1fpVKCqJ2Bra5tzP0Lcw3Vgye4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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