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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea7a41db7cf999cda4e160310f066e1b11ce9238d594be9de8e23b7480224f7' 
  AND token = 'EV/mzyOP0Y9AiupJEtblNz8dASOMLrSHVcSQHpghFv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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