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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b50b08ce4be152249f6b144b9d9f3c50fb9c8a62f20642032d82573c71e99b' 
  AND token = 'RIDSMytHu8R+Em0LCJKpokDPNxir/RbWCVcnTey6gZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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