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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0f728c54d80d5e8f9b828409d075580a330cb05d324d405363df71ea7d783c' 
  AND token = '7PIJFK+eUNG/q3lgMGlXuKoUa6aX6C30+vpn4liR3AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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