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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b383d1f1e075d281129eab886d3fc526d9d306aed4eaf4e159a72c2796a055bd' 
  AND token = '1xMgKewVAcZS2Butj99ar5OFyRmpT4S3H8OZZOTnUjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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