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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9849e2633ff505766c6726e10c1ea6212d6d9dd24fec0f0ef4a5e7fe9bd46bb2' 
  AND token = 'siyaSk60n8vrZwToCF7vhyaFobd9xupOZ3/IitG1CAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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