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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb326e3c0155400967d9bcab42f0e199812e13ed37e9a2982949e1f44d9a0a0' 
  AND token = '1oQH1aOM3m9po5odly8o5AlBMBNaukSqJPZzYIeoZbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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