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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a5943ae7af5ea5ca3d993dac9713c0245618e7bfc32824b832fe03791bc7e8' 
  AND token = '2nCz9dJJSKBvlRfuhkENtAfgm2QHq4s7K9CaBzofG1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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