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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cadba07b75473031d5e470f230fcd17aaccd599b6e9fdaf988626dcc4d027707' 
  AND token = 'hafbB68s1ZirQi5dChIYM1X1+vdA7oCGgT63Rr43FvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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