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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a7155ff8b2fdaf5b49281d4ce64c43508001d8337c255bfff1f50602f8d5b01' 
  AND token = 'T7l6puZ/6f7Y1L0Kaa0+1cBI761A7KhN0bwVOl6QD60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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