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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db1ce7977e0fd829f6b1f773c60350b72fbcd6fc97cbc4e8741b4454db18c06' 
  AND token = 'vbnI8RYXB3SG7LDUD0Uppzb0w2u3z3Yy7x3Ka/MKjT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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