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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09dec5f22b425d03e587792a48aafd6d73792f31c58b58cffd685a36d3f67a9d' 
  AND token = 'DmNGzajh8QoaccjVrzot4qdePh1DHUPf6aCyA23fkaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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