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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956b1e07fb4e472287a3c39e62804f8e837e34a05ca5caad0a136b796dd58a0f' 
  AND token = 'PPoXNvwkFPbK/tqhKFpHXQ1EG5uDPme2sX1a84U2CEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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