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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce07f239f366e6d6db124bd5edb43d622f4800b2e7a78e51876a69e43fcfab6b' 
  AND token = 'yIT7hbFw65szdlRj8xj+aN4/+veUNWPfVRIvKXgTCjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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