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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea0d9beed1cd5081001339f8326908109e696646e52a109a34104ad012336a9' 
  AND token = 'akF5gxApRMRy3oyl/sAXH2hXVdXENARboodzf0MxPb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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