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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2177e547ae2aa42aac903e7f054791ad8206d5714e1c12c81bfd986664a752a8' 
  AND token = 'jRzYrTl2F3b7LkPwQT506LDpeDNJWqlQ7/OoxfJs2Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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