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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccff0741cf1905ce9b890b4c66c19757e1ef9feb5f48a3600967f9ee72e1c00e' 
  AND token = '4azRDC0veGplKwgUI0Iw1aySYYbJxWEzjmoDkPpVAuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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