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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039a4a3cadaba3c142845f084b27c3b02391f7424c6ab737631d1088a2da4544' 
  AND token = '0CqFhKwZZbWE2ybfl72Qz76otpKUaCWg252JQlYz6HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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