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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f0e2d088eb24f132e2ca56c78dfbae67faef198beae40c236a01951c128c34' 
  AND token = 'mk95LWzG/xyTIN4lIxL7cTq5IzmTnuNcYXxne/377eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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