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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ca006f0d82803f4fc7a2d42662dfa3af105383df3e154e085179645aec6fde' 
  AND token = 'ojI1jGfWcU0mVBiAvVKWNXbRs67MzxgNN5NbibGhtWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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