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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7970ef736c1a0ba8ce7de93e428d194a4301a17ae4ef515f939fb9096c531d15' 
  AND token = 'iLTCi97gV0l7EFqZ4OvjN4Lp5xWn2Oo31OcJlkNMy4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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