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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb6a1449cf1e5e14582cba30ef6f8ac32c749e37b6b91cccd55dc5b38d275fe' 
  AND token = '30ManC46wDFagMauHaX3x3Tut7n3Fc6BTLgga/qMzQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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