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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbeed38125033416bb6223a16975fcb7a8642151bb7e7d5d4c977e27120a841e' 
  AND token = 'W2fTmnhR2N4MX/a08BOQfVlR94C2pha2DXJUcvTFeDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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