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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fca8119f335a1dea80f8b2b9a19b5c7e96b6c86cb86562f357e406c9f96ab44' 
  AND token = 'LpMoX6mP0oLnmmM8cvgw/Apzon9Psby2sSgD7YTC7aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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