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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c6269818b3c629ad3e2a9cab99c83dc4f422fa2bde969277d98187bce955ad' 
  AND token = 'ttUYhWiBI5RcfkPL+2iOace6t+aFQqCUaRP+SK+GzvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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