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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab4c4755e3c32a1ae1f9ce7f1ca9e7e0a3e7dd5250be0a253e00262c15efa02' 
  AND token = 'rmX4SrjqxLT3p+TfWPFw3X+vCztr9ZVQyMzUyXwSNak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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