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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6043e22e1c94b0db7defa5bce03cff11d1bbda44f601e8c486b77d64ab8e3a' 
  AND token = 'g6C5VUuTV94J6i0NX3bdAE984zyrEcGDYTGQKQIIUaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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