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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7739e6dbf632a3ae48d05aab9c20034ae4007ada3ba950df9f51f2db6c92b54e' 
  AND token = '79J+Nv9UXwvCNGSe0v6DFOaoah5JUny8katdJMlYUQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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