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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14111fca3514e0571c9f186cce7b81b4082ac95b98542d68f4c1c535e3aaf3f' 
  AND token = 'jUZSufZ3oRDkoOqsQ5ryBUq9XUlmhpF4ZPoldX5uFkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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